AD7713AN - 24-Bit Sigma-Delta Signal Conditioning ADC | Analog Devices
MPN: AD7713AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $53.75 | $53.75 |
| 10 | $48.38 | $483.80 |
| 100 | $43 | $4,300.00 |
| 500 | $38.5 | $19,250.00 |
| 1,000 | $34.95 | $34,950.00 |
AD7713AN Overview
A sigma-delta ADC is a type of oversampling converter that trades raw sampling speed for very high resolution by pushing quantization noise to high frequencies and then aggressively digital-filtering it away. The AD7713AN belongs to the family of signal-conditioning ADCs that combine the converter with on-chip calibration, programmable gain, and a flexible serial interface. This architecture sits inside the broader hierarchy of data-acquisition ICs -> precision ADCs -> 24-bit sigma-delta converters -> industrial measurement front ends, making it a turnkey front end for bridge sensors, RTDs, and thermocouples in noisy factory environments.
Key features include 24-bit no-missing-codes performance, an effective resolution up to 21.5 bits at the 60 Hz output rate, and on-chip self-calibration that removes both offset and gain errors. The analog front end accepts differential or pseudo-differential inputs with software-configurable gains from 1 to 128, and the LC2MOS front-end design maintains low input currents for direct connection to high-impedance sensor bridges. A 150 µW typical power-down mode makes the part attractive for loop-powered and battery-backed instruments.
Architecturally the device uses a fourth-order sigma-delta modulator followed by a programmable low-pass digital filter, with the modulator sampling far above the Nyquist rate. The on-chip calibration registers store zero-scale and full-scale correction coefficients, which the user can invoke at any time to compensate for drift caused by temperature or aging, an important advantage over un-calibrated ADCs in long-deployment instrumentation.
Typical applications include weigh scales and load-cell readouts, strain-gauge bridges, industrial process-control analog input modules, temperature measurement with RTDs and thermocouples, portable loop-powered 4-20 mA smart transmitters, and chart recorders. The wide dynamic range also suits acoustic and vibration transducers where small signals sit on top of large DC bias.
When designing with this device, evaluate the input common-mode voltage carefully because the sigma-delta modulator rejects common-mode noise only within the configured input range; a poorly biased bridge will degrade effective resolution. Provide a clean analog ground and a low-impedance reference - the AD7713AN's accuracy is fundamentally limited by reference noise and PCB layout.
This page combines distributor pricing, drop-in alternative parts in the same 24-pin DIP package, and practical design considerations not aggregated on any single distributor page.
Drop-in alternatives for AD7713AN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
AD7713ANZ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7713SQ
✅ Drop-In📋 Reference alternative (not in catalog)
AD7713AN Maximum Ratings & Electrical Characteristics
| Manufacturer | Analog Devices |
| Part Number | AD7713AN |
| Resolution | 24 bits |
| Number of Inputs | 1, 2 (differential/pseudo-differential) |
| Converter Type | Sigma-Delta |
| Package / Case | 24-PDIP (0.3 inch wide, through-hole) |
| Data Interface | Serial (3-wire SPI/QSPI/MICROWIRE compatible) |
| Input Type | Differential, pseudo-differential |
| Architecture | LC2MOS sigma-delta with programmable gain amplifier |
| Programmable Gain Range | 1 to 128 |
| Power-Down Mode Current | 150 µW typical |
| Operating Temperature Range | -40 °C to +85 °C (industrial) |
| Temperature Grade | Industrial |
| Terminal Form | Through-Hole |
| No. of Terminals | 24 |
| Package Code | DIP |
AD7713AN Pin Configuration
| Pin 1 | SCLK — Serial clock input for the ADC serial interface |
| Pin 2 | DOUT — Serial data output from the ADC |
| Pin 3 | DRDY — Data ready output indicating valid conversion |
| Pin 4 | MODE — External crystal/clock mode select |
| Pin 5 | XTAL1/XCLK — Crystal or external clock input |
| Pin 6 | XTAL2 — Crystal connection (leave open if external clock) |
| Pin 7 | DVDD — Digital supply voltage |
| Pin 8 | DGND — Digital ground |
| Pin 9 | REF IN+ — Positive reference input |
| Pin 10 | REF IN- — Negative reference input |
| Pin 11 | REF GND — Reference ground |
| Pin 12 | AGND — Analog ground |
| Pin 13 | AVDD — Analog supply voltage |
| Pin 14 | AIN1+ — Analog input 1 positive |
| Pin 15 | AIN1- — Analog input 1 negative |
| Pin 16 | AIN2+ — Analog input 2 positive (or pseudo-diff return) |
| Pin 17 | AIN2- — Analog input 2 negative |
| Pin 18 | PWDN — Hardware power-down input (active high) |
| Pin 19 | CAL — Calibration mode select / calibration pin |
| Pin 20 | CS — Chip select for serial interface |
| Pin 21 | FSYNC — Frame sync for serial interface |
| Pin 22 | STANDBY — Standby control input |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
Typical Applications
AD7713AN is suitable for 6 applications: Weigh Scales and Load-Cell Readout, Industrial Process-Control Analog Input Module, RTD and Thermocouple Temperature Measurement, Portable Loop-Powered Smart Transmitter, Strain-Gauge Bridge Instrumentation, Acoustic and Vibration Sensor Digitisation.
Weigh Scales and Load-Cell Readout
The AD7713AN's 24-bit no-missing-codes sigma-delta architecture, programmable gain up to 128, and on-chip self-calibration make it an ideal ADC for weigh-scale and load-cell digitisation. With an effective resolution of about 21.5 bits at the 60 Hz output data rate, the part resolves microvolt-level bridge signals directly without an external INA, simplifying the analog front end. The integrated digital filter rejects 50 Hz/60 Hz mains interference, which is essential for stable weight readings on factory floors. Calibration registers stored on-chip remove offset and gain drift over temperature, eliminating the need for periodic user recalibration in long-deployment scales. For a 1 kg / 2 kg / 5 kg platform scale, the AD7713AN typically achieves better than 0.01 % FS linearity when paired with a low-noise 5 V reference such as the ADR01.
Recommended
Industrial Process-Control Analog Input Module
In a 4-20 mA loop-powered or 24 V bus-powered analog input module, the AD7713AN provides a single-chip digitisation path for RTD, thermocouple, or strain-gauge sensors. Its differential input pair rejects common-mode noise picked up on long field wiring, while the LC2MOS front end maintains low input bias currents suitable for high-impedance RTD bridges. The programmable gain amplifier lets the same PCB handle multiple sensor types via software configuration, reducing BOM variants. Hardware power-down at 150 µW supports loop-powered designs where the ADC must wake periodically, take a reading, and return to standby. The serial interface also makes the part simple to isolate with digital isolators for high-voltage industrial channels.
Recommended
RTD and Thermocouple Temperature Measurement
The AD7713AN digitises the low-amplitude outputs of PT100/PT1000 RTDs and K-type or J-type thermocouples directly, thanks to its programmable gain up to 128 and built-in 50 Hz/60 Hz notch. At a 10 Hz output rate the part delivers better than 16-bit noise-free resolution, which corresponds to sub-0.1 °C temperature resolution when paired with a four-wire PT100. On-chip calibration removes thermocouple-cold-junction-compensation offset, simplifying the firmware task. The pseudo-differential input mode is well matched to thermocouple measurements where the thermocouple tip sits at a different common-mode voltage than the board ground.
Recommended
Portable Loop-Powered Smart Transmitter
Loop-powered 4-20 mA smart transmitters benefit from the AD7713AN's 150 µW hardware power-down mode and low supply current, allowing the ADC and microcontroller to share the 4 mA quiescent budget on the loop. The serial interface requires only a few microcontroller pins, simplifying the isolated barrier. Because the converter integrates gain, filter, and calibration, the analog bill of materials is minimal - typically just the bridge sensor, a reference, and bypass capacitors. The wide industrial -40 °C to +85 °C temperature range matches the harsh environments of process plants and outdoor installations.
Recommended
Strain-Gauge Bridge Instrumentation
For strain-gauge bridges used in structural-health monitoring and pressure transducers, the AD7713AN's differential inputs and programmable gain digitise microstrain signals of a few mV/V directly. The wide common-mode input range accommodates bridges driven from a 5 V or 10 V excitation rail without level shifting. On-chip self-calibration corrects for thermal gain drift of the gauge itself, which is a major source of long-term error in field installations. The 24-bit output word can be averaged in firmware to push effective resolution to 22+ bits for quasi-static strain measurements on bridges, buildings, and aerospace structures.
Recommended
Acoustic and Vibration Sensor Digitisation
The AD7713AN is well suited to digitising piezoelectric accelerometers and hydrophones that deliver small AC signals on top of a large DC bias. Its pseudo-differential input stage and high common-mode rejection preserve the small AC content, while the sigma-delta digital filter can be configured with a wider bandwidth (up to ~1 kHz) for vibration analysis. The 24-bit dynamic range captures acoustic transients spanning more than 100 dB without range switching. When used in a sound-level meter or seismic sensor, the part's on-chip calibration keeps the gain stable over temperature, which is critical for traceable acoustic measurements.
Recommended
Recommended Products Summary
Engineering reference data for AD7713AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | AD7713ANZ | AD7713SQ |
|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices |
| Package | 24-PDIP (plastic DIP) | 24-PDIP (plastic DIP) - same | 24-CDIP (ceramic DIP) - same pin count |
| Resolution | 24 bits | 24 bits | 24 bits |
| Architecture | Sigma-delta with PGA | Sigma-delta with PGA | Sigma-delta with PGA |
| Programmable Gain | 1 to 128 | 1 to 128 | 1 to 128 |
| Operating Temperature | -40 °C to +85 °C (industrial) | -40 °C to +85 °C (industrial) | -55 °C to +125 °C (military) |
| Lead Finish | Standard lead (SnPb) | Lead-free (RoHS) | Standard lead (SnPb), hermetic ceramic |
| Power-Down Current | 150 µW typical | 150 µW typical | 150 µW typical |
Key Differentiators
- Lead-free drop-in variant preserves the original die and pinout (vs AD7713ANZ)
- Military-temperature ceramic-packaged option in the same 24-pin DIP footprint (vs AD7713SQ)
- True sigma-delta front end with on-chip PGA versus higher-throughput delta-sigma parts (vs AD7731BNZ)
Design Notes
The AD7713AN operates from a single +5 V analog supply (AVDD) and a separate digital supply (DVDD); tie them together at a single ferrite bead for noise isolation. The 150 µW hardware power-down mode is invoked by holding PWDN high; wake-up time is set by the input RC network on the reference pins and the digital filter settling, which together dictate the maximum sampling cadence in loop-powered applications.
Lay out the 24-pin DIP footprint with a single-point analog ground tied to the AGND pin and a star-ground connection to DGND at the supply entry. Keep the analog input traces (AIN1+/-, AIN2+/-) short and symmetric, and place a 10 µF tantalum plus 0.1 µF ceramic decoupling pair as close as possible to AVDD and DVDD. Reference decoupling on REF IN+/- is equally critical - the sigma-delta modulator rejects noise only when the reference pin sees a low impedance across the band of interest.
Estimated: at the highest gain of 128 with a 5 V reference, full-scale input span is roughly ±20 mV; thermocouple and strain-gauge users must therefore guard against ground-loop pickup and EMI on the input traces, which can easily exceed this span. Also note that the calibration registers are volatile - they must be re-run at every power-up and after significant temperature excursions, otherwise the offset/gain correction will not match the actual sensor conditions.
Route the serial interface (SCLK, DOUT, DRDY, CS) away from the analog input traces, and use a ground trace between the analog and digital sections of the PCB. When isolating the ADC from the microcontroller, an iCoupler digital isolator such as the ADuM1411 preserves the serial-interface timing; isolators introduce ~10-25 ns of jitter that may require lowering the SCLK rate to remain within the ADC's serial read setup/hold window.
Compliance Information
Legacy AD7713AN uses standard lead (SnPb) finish; choose AD7713ANZ for RoHS-compliant lead-free builds. Reach, halogen-free and conflict-minerals status were not present in the verified web data and are marked unknown pending confirmation from Analog Devices.
